Interrupter-point grinder



Patented Dec. 7, 1926.

.UsED@Sterns met@ FRANK- GABPJEL .ANB LAWRENCE G; .stroom-Lor ,Los `ancianas,fiCaumartin; sArD v'- 'i snooKAssrGNoR crous-Herner Hrs aterra 'ro GERALnAfr/IACLEAN, orjrasa- ADEN-A, AL'IF'onNIA.

` INrERaUrVTER-ronir G'RINDER.f

f l :Application aledma'y 29, 1924.. serial No; 716,:70'2.-

This* ini'nantion` is an interrupter point 'grinder and.consists of` the novel featuresl herein shown, described and claimed. Y

An 'object is to make a lSimple vdevice which will hold g any of thevarious constructions carrying interrupterpointsand grindflat4 point' grinder embodying the principles ci our invention. y y

Fig. l is a perspective interrupter point grinder set up for holding and grinding one iormofinterrupter point.

Fig. 2 yis aside elevatlon as indicated by *i the arrow 2 in Fig..1,jparts being-broken away and shown in section.

Y Fig. 3 Vis a plan View Oft-hejparts shown" AVin Figs. `1 and 2 'and showing a different operation.

. Fig. 4I is a plan viewanalogous to Fig. 3

showing still another operation.

Fig. 5 is a side elevation as indicated by" thearrow 5 in Fig. 4. Y

The de tails of'construction and operation shown in the drawings are asfollowsz' The .ibase 1 is rectangular in plan and has -a iinishedrhorizontal upper face V2; and av 1 second: finished horizontal upper face 3,v

there being a vertical finishediface 4 con-l necting the adjacent edges of the faces 2 and 3. Theface 2 is substantially twice as 'Wide as the face 3. I i

' The sliding carrier base 5 is rectangular in plan and has a. finished flower face 6 so that the base 5 will slide freely upon the face '2, andhas -a `finished. side face 7 to slide Vfreely againstthe face 4. Round pins 8V and rv9 are'plfiXed in the carrier base 5 in transverse alinement Vand in -a line crosswise ofV the faces 2, 3 andv4. Expansioncoil springs 10 and 11 are mounted upon the carrier base raround the pins 8 and V9. The clamp# carrier 12 has vertical openings'V to receive the pins 3.'` and -9loosely and rests uponthe springs 10and 11, the tensions of the springs" being exerted to hold the carrier 12 elevated. g A slot 13 is formed from the end of the clamp carrier 12 which extends over the face 3 and a clamp screw 14 is inserted horizontally through the material at one`A side of the slot 13 andy tapped through the material atthe other side of the slot so that byv tightening j the screw the 1 clam ing' i tongues A15 and 16 fon opposite 'sides o the i ,slot 13 are drawn]toward'each-other; i Verti-Y`v `cal `:circular openings- 1 are y formed along the slotrlfthe openings being of various Vsizesas reouiiredV to 'receive and, clamp' posts',`

studs; binding-"screwsfand interrupter point n f inserted into ythe desired oneV of the Lvopenings 17 and clampedV byimanipulating 'the screw y.142,and. then the carrier12 is Vmanu-v ally pressed downwardly to bringvthe face carrier 12 are 1 manually f'moved .-longitudi- -nally-to producethegrinding action.- Inl l Fig. 1, the grinding action VVwill be a straightl v reciprocating motion fit the face 7 [bears upon the abrasiveY material 19'may be varied in,parallel'lines'bynmoving the base 5 to or frointhe, face 4. In Fig.' 3, thecarrier` 12 is applied fonlyl toone of the pins 8 or 9, and

carriers 13. Ai piece 19 of a sheet ofemefryV cloth, lemery paper,'san,d paperVorg'othe'r suitable abrasive material 'is )laid Y fupon the face 3 and the article 148, to be'4 ground is of .the interrupter point intoV contact with@ i Vthe abrasive material 19 land the ,ibase 5 and `against-thegtacefetand the point-ofcontact then the carrier 12may be operated` with a compoundf rotary reciprocatingv and longitudinally Vreciprocatingmotionl p A seriesv of holes. 20 is vbored horizontally through the carrier 12 in thevicinity ofthe vertical openingsl receivingth'e pins 8 and'9. 'A clamp consistlng of lan irregular'head 21, p

ascrew 22 extending fromthe head and a wing'nut 23 upon V'the screw is used for ing interrupter poi-nts, the constructions' be# comprisesa resi-lient flat straight member .no I lclamping: and lholding 'constructions'V carryy ing such thatthey cannot befclamped in the -manner shown in Figs. 1,A 2 and 3. In `Fi`,f ,s.V l4v and ythe interrupter construction shown"` 24carryinganv interrupter point 25 at vone end and having' a Z-shaped arm 26 atthe f' -A other end. "VVh'en vit isdesired to grind the point V25, 4the carrier 12v is raised from the pins 8j and `9` and turned endV from end and. the members 24 rand Y26 varefplacedv edgewise4 against the side ofthe carriery '.12 with the vscrew 22 extending through one `of' the holes 2O and thenut23 applied to hold the interrupter vrigid'while the pointv 25` is ground by reciprocation upon the abrasive material Thus we have, `produced an interrupter )oint frrinder com risinr a'ba'sehavin two lioizontlyiinished upper faces Von different.-

levels and finished vertical tace connecting confronting edges of the horizontal faces, a sliding carrierfbase adapted to operate upon Vthe loWei iinished face, pins projecting ,upwardly fromv the sliding carrierV base,v expanson'springs upon theV pins, a

movedfto grind theV points.'vv

K Yziriousfchanges may he ,made Without departing @from the spirit :of our invention I as elamed..

Ne claim s* v An `vint-ferrupter [point .grinder .comprising moved A1to .grind thepoints,

a hase-having two horizontal finished uppeif `feces on different levels and a finished V'eiti cal face connecting vconfronting edges of v vthe horlzontalvlfaces, a sliding.certifiery base' adapted to operate uponsthe lower l,finished face, pins ,piojeeting/upwardly;from theY sliding carrier base, expansion springs upon the pins, a clamp carrier slidmgly mounted upon the plus againstitlie springs, and means .for clamping Vyzirtielesr-*having interrupte1.V points to the'dampeatrier soV that ,theilnten iupter points may he engagedwith'brsive material upon, thef upper finished face and Y In testimony Wheeof ywe names to this speeiezi'tion..

' FRNKGABRIEL: Y j

SHOOK y have `signed. oui1V 

